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<p>In this study, we have analyzed a dense fog episode over Kolkata airport that occurred during 23/01/2025 to 24/01/2025. We have utilized half-hourly meteorological data from the NSCBIA METAR, radio sounding data from the University of Wyoming, as well as upper air wind, specific humidity, mean sea level pressure, 10-m wind, and vertical integral of moisture flux divergence data from ERA5. Our findings indicate that the dense fog during these dates was strongly influenced by the prevailing anti-cyclonic circulation, which facilitated essential moisture advection from the Bay of Bengal to Gangetic West Bengal. Additionally, we have observed differences in the characteristics of the dense fog on the two dates based on the boundary layer characteristics and meteorological setup. The fog on January 23/01/2025, 00 UTC, has been classified as radiation + advection fog, meeting the necessary criteria, while the fog on 24/01/2025, 00 UTC, has been identified as cloud base lowering fog.</p>

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Dense Fog Episode Over Kolkata Airport During 23/01/2025 to 24/01/2025: The Synoptic Influence

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Pravat Rabi Naskar,
  • Gyan Prakash Singh

摘要

In this study, we have analyzed a dense fog episode over Kolkata airport that occurred during 23/01/2025 to 24/01/2025. We have utilized half-hourly meteorological data from the NSCBIA METAR, radio sounding data from the University of Wyoming, as well as upper air wind, specific humidity, mean sea level pressure, 10-m wind, and vertical integral of moisture flux divergence data from ERA5. Our findings indicate that the dense fog during these dates was strongly influenced by the prevailing anti-cyclonic circulation, which facilitated essential moisture advection from the Bay of Bengal to Gangetic West Bengal. Additionally, we have observed differences in the characteristics of the dense fog on the two dates based on the boundary layer characteristics and meteorological setup. The fog on January 23/01/2025, 00 UTC, has been classified as radiation + advection fog, meeting the necessary criteria, while the fog on 24/01/2025, 00 UTC, has been identified as cloud base lowering fog.